The grades are named based on their minimum yield strength (in MPa): Detail of GB/T 16270-2009 - Code of China
Improved chemical compositions for specific grades to enhance weldability and toughness. Conclusion
: Phosphorus and Sulfur are kept strictly low (often under 0.020% or 0.015% for premium grades) to maximize internal cleanliness and prevent tearing. Mechanical Property Requirements For a standard plate thickness (typically ≤50is less than or equal to 50 mm), the steel must hit these benchmark metrics: Steel Grade Min. Yield Strength (MPa) Tensile Strength (MPa) Min. Elongation (%) Q460 550 – 720 Q550 670 – 830 Q690 770 – 940 Q890 940 – 1180 Q960 980 – 1150 Typical Industrial Applications
: Covers designations, dimensions, shape, weight, technical requirements, testing methods, and quality certification. gb t 16270 pdf
Special containers requiring high pressure resistance without excessive wall thickness. International Equivalents
If you need help analyzing specific requirements of this standard, let me know:
As of the latest revision (currently up to 2023 amendments), GB/T 16270 is increasingly focusing on: The grades are named based on their minimum
Where high-strength steel is required to handle pressure without excessive weight. 4. GB/T 16270-2009 PDF Download and Access
: Specifically covers high-strength structural steel plates delivered in quenched and tempered (Q+T) conditions. Thickness Limits : Applicable to plates with a thickness not exceeding (extended from 100mm in the previous version). Reference Standards
Which standard you are comparing it against Yield Strength (MPa) Tensile Strength (MPa) Min
GB/T 16270 is a national standard issued by the Standardization Administration of China (SAC). The designation letters carry specific meanings: Guobiao (National Standard) T: Tuijian (Recommended Standard)
Chinese standards often allow slightly wider tolerances on thickness dimensions but have stricter rules for low-temperature impact testing.
The core of the standard establishes mandatory minimum targets for: The stress level at which plastic deformation begins. Tensile Strength ( Rmcap R sub m
) to harden them, followed by reheating to a lower temperature ( ) to restore toughness and reduce brittleness. Practical Applications : You will find steel produced under this PDF standard in: Mining Machinery : Such as electric shovels and mine dump trucks. Construction Equipment
| Grade | Yield Strength (MPa) Min | Tensile Strength (MPa) | Elongation (%) Min | | :--- | :--- | :--- | :--- | | | 460 | 550 - 720 | 17 | | Q500 | 500 | 590 - 770 | 17 | | Q550 | 550 | 670 - 830 | 16 | | Q620 | 620 | 710 - 880 | 15 | | Q690 | 690 | 770 - 940 | 14 |